-15=-a-4a

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Solution for -15=-a-4a equation: 



-15=-a-4a

We move all terms to the left:

-15-(-a-4a)=0

We add all the numbers together, and all the variables

-(-5a)-15=0

We get rid of parentheses

5a-15=0

We move all terms containing a to the left, all other terms to the right

5a=15

a=15/5

a=3

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